盐胁迫对玉米幼苗叶片光合荧光和抗氧化酶活性的影响

摘要

Using maize(B73)seedlings as experimental materials,the photosynthetic efficiency and activities of SOD,POD and CAT of leaves were investigated under salt stress. The results showed that the low concentration of NaCl(100 mmol/L)had little impact on the photosynthetic efficiency of maize seedling leaves,but high concentrations of NaCl stress(200 mmol/L or more)could significantly affect on the photosynthetic efficiency. At the same time,the activity of antioxidant enzymes displayed a synthetic positively correlation. However,in response to high concentration of NaCl stress,the antioxidant enzyme system(SOD,POD and CAT)activity showed a decreasing trend after the first rise.%以玉米品种B73幼苗为试验材料，研究盐胁迫对其光合荧光和抗氧化酶活性的影响。结果表明：低浓度的盐胁迫（100 mmol/L）对玉米幼苗叶片的光合效率影响不大，但是高浓度的盐胁迫（200 mmol/L以上）对玉米幼苗叶片的光合效率影响明显，且随着时间的延长不断加剧。同时，体内叶片抗氧化酶的活性变化同光合作用成正相关，说明在盐胁迫情况下，玉米幼苗可以通过启动抗氧化酶的活性来应答盐胁迫。此外，在应答盐胁迫时，玉米幼苗体内抗氧化保护酶系统（SOD、POD、CAT）活性会呈现出先升高后降低的趋势。